In our classification of emerging or reemerging infectious diseases, we treated antibiotic-resistant bacteria and E. coli O157:H7 as new disease sources. Make the case for and against considering a...

In our classification of emerging or reemerging infectious diseases, we treated antibiotic-resistant bacteria and E. coli O157:H7 as new disease sources. Make the case for and against considering a member of an established disease-causing species that acquires a new trait a new disease entity. What is the significance of such changes in bacterial pathogens?